Method for regulating the heating of coke ovens

ABSTRACT

INSTRUMENTS MEASURE THE TEMPERATURE OF THE FLUE GASES AT SELECTED POINTS AND, FROM A MAXIMUM READING, CONTROL OF THE TOTAL HEAT SUPPLIED TO THE COKE OVEN FLUES IS AUTOMATICALLY EFFECTED BY A WOBBE INDEX OR CALORIFIC VALUE CONTROLLER, OR OTHER GAS FLOW REGULATING DEVICE.

Jan. 19, 1971 E, KUMPER 3556,@@7

METHOD FOR 1= EGULATING THE HEATING4 0F COKE ovENs Filed Sept. 16, 1968 2 Sheets-Sheet 1 LEGEND MAX/MUM rfMPf/m me! sn fc rox? 70 COKE FIG. i

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METHOD FOR REGULATING THE HEATING 0F COKE ovENs Filed Sept. le, 1968 E. KMPER Jan. i9, 1971 2 SheetS-SheerI 2 COKE S/DE E E] El-;

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INVENTOR. .6m/sr Ku'MpE/e BYS United States Patent O1 ee Patented Jan. 19, 1971 U.S. Cl. 201-1 4 Claims ABSTRACT F THE DISCLOSURE Instruments measure the temperature of the tine-gases at selected points and, from a maximum reading, control of the total heat supplied to the coke oven ilues is automatically effected by a Wobbe Index or calorific value controller, or other gas ow regulating device.

BACKGROUND OF THE INVENTION This invention relates to coke ovens and more partielllarly, to a method for regulating the heating of coke ovens.

In operation of coke ovens one endeavors to adjust the temperature in the heating flues as high as possible to shorten the coking time and to improve the economy of the plant. On the other hand, however, care must be taken that a definite temperature limit is not exceeded, since otherwise the refractory masonry would soon be destroyed. Furthermore, an overheating of the coke must be avoided. A supervision of the heating of coke ovens for obtaining an optimum operation is indispensable at high' operating temperatures.

The process of the invention, which assures such a regulation of the heating, consists in measuring the temperatures of the ue gas in the heating walls at the places where the highest values are to be expected; determining the maximum value from the results of 4these temperature measurements; and supplying this value to a temperature regulator, which in turn adjusts the nominal value of a control that influences the supply of heat to the ovens. This control can be a gas-pressure regulator, a flow regulator, a Wobbe Index or caloric value control, or also a thermostat.

In case of mixed-gas heating, another proposal o f the invention consists in increasing or reducing the proportion of rich gas, for example liquefied gas or natural gas, by the Wobbe Index or calorifc value control; but simultaneously maintaining at a constant value the total supply of heat, by reducing or increasing the proportion of lean gas. Overheating of the refractory masonry can be avoided with certainty in this way so that, as a'l result of the constant supply of heat, the coking time is not varied.

According to experience, in coke ovens with twin heating ues, the highest temperatures of the flue gas are to be expected at the reversal place of the third or fourth heating ue from the coke side; so that, it is recommended that the temperature be measured there by means of a thermocouple or a radiation pyrometer. These instruments for measuring the temperature can be provided in all heating walls of a coke-oven battery. In general, it is sufcient to measure the temperatures in the heating walls of one group of coke ovens, generally ve or six ovens, representatively for the entire battery, and to determine the highest value from these measured results in a temperature selector and to use it for regulation of the heat- SUMMARY OF THE INVENTION The method forl regulating the heating of coke ovens includes measuring the maximum temperature of the flue gases and, from such measurement, automatically controlling the total amount of heat in the coke oven ues.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:

FIG. 1 illustrates the wiring diagram for heating coke ovens with only one type of gas;

FIG. 2 illustrates the wiring diagram when a lean gas and a rich gas are used; 4

FIG. 3 is a schematic representation of coke oven heating tlues and means for the measurement of temperature therein; and

FIG. 4 is a schematic representation of a portion of a coke oven battery showing a plurality of heating ues and ovens and the' means for the measurement of temperature in the ues.

DETAILED DESCRIPTION Referring to FIG. 1, instruments for transmitting measured temperatures are installed at five characteristic places of the oven battery, preferably the reversal places of each heating flue of five heating walls belonging to a group of ovens and the voltages or currents originating from these instruments are conducted through line 10 to a temperature selector 11. The latter instrument selects the highest value from the input voltages or currents and conducts it to the temperature control 12, which in turn adjusts the nominal value of the control for the supply of heating gas. This control is illustrated here as a Wobbe Index or calorific value control 13. The butterfly valve 15 in the gas line leading to the oven battery is influenced in dependence on the Wobbe Index or calorilic value control 13 via the pressure regulator 14, and the supply of heat to the ovens via branch lines 17 is adjusted according to requirements.

In the modification of the invention conforming to FIG. 2, the highest of the therrnoelectric voltages supplied through lines 20 is also rst determined in a temperature selector 2 1 and conducted to the temperature regulator 22. The latter again adjusts the nominal value of the Wobbe Index or calorifc value control 23, which influences a flow regulator 24. The flow regulator 24 is connected by transmitters 25 and 26 with measuring diaphragms 27 and 28, in line 29 for rich gas and in line 30 for lean gas, respectively. The buttery valve 31 in line 29 for rich gas is operated by the ow regulator 24 and the proportion of this .gas is increased or reduced thereby. The amount of mixed gas is simultaneously increased or reduced via the Wobbe Index or caloric value control 32 and the pressure regulator 33 by means of the butterfly valve 34 in the mixed gas line 35 to such an extent that the total supply of heat to the coke-oven battery via branch line 36 is not varied.

FIG. 3 represents schematically coke oven heating ues wherein electrical leads 77 are connected to suitable heat detecting elements 79 in the third flue, for example, from the coke-side end ue. Preferably, the temperature is measured in the third heating flue from the coke side of the battery and the electrical leads 77 connect to a temperature selector 81, similar to the temperature selectors 10, 20 mentioned herein before.

FIG. 4 illustrates schematcially a group of adjacent coke even chambers 1-5 of a coke oven battery 83 with a temperature sensor instrument in each third llue from the coke side, and an electrical lead 87, from each sensor 85, connected to another temperature selector 89, similar to the temperature selectors 10, 20, 8l.

4 Although the invention has been described herein with 3. In coke ovens having twin heating ilues, the method a certain degree of particularity, it is understood that the of claim 1 including the step: present disclosure has been made only as an example and (a) measuring the temperatures of the ue gases at the that the scope of the invention is dened by what is herereversal location of a selected Hue not immediately inafter claimed. adjacent the endmost ue on the coke side of said What is claimed is: D coke oven. i 1. The method for regulating the heating of coke ovens 4. The method of claim 1 including the step: of a coke oven battery comprising the steps: (a) measuring the temperatures of the flue gases only (a) measuring the temperature of the ue gas at a sein the heating walls of one group of ovens of the lected location in each one of the heating walls of a battery. group of said coke ovens; 10 r (b) determining the maximum value from these tem- References Cited perature measurements; v UNITED STATES PATENTS (c transmitting such maximum value as a signal to a 1,876,037 9/1932 Becker 1 1 emperature regulator, and 2 554 818 5/1951 .D zdf 1 (d) adjusting a control operative in response to a com- 3319887 5/1967 G'llg; "236 15 mand signal from said regulator and thereby regu 3,351,331 11/1967 Martin 236 15 lating the supply of heat to said coke ovens. 2. The method of claim 1 including the steps:

(a) heating the coke oven by burning a mixture of lean 2O WILBUR L BASCOMB, JR., Primaiy Examiner and rich .gas in the ilues thereof; and D. EDWARDS, Assistant Examiner (b) automatically controlling the total supply of heat generated in said ues by reducing or increasing the US CL XR proportion of lean gas and by increasing or reducing 202 151; 23,6 15 the proportion of rich gas. 25 

